1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 1992 Christopher G. Demetriou 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. The name of the author may not be used to endorse or promote 16 * products derived from this software without specific written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 */ 30 31 #include <sys/cdefs.h> 32 #include <ctype.h> 33 #include <err.h> 34 #include <errno.h> 35 #include <fcntl.h> 36 #include <stdio.h> 37 #include <stdlib.h> 38 #include <string.h> 39 #include <unistd.h> 40 #include <sys/types.h> 41 #include <sys/ioctl.h> 42 43 static void usage(void) __dead2; 44 45 static void 46 usage(void) 47 { 48 fprintf(stderr, 49 "usage: comcontrol <filename> [dtrwait <n>] [drainwait <n>]\n"); 50 exit(1); 51 } 52 53 int 54 main(int argc, char *argv[]) 55 { 56 int fd; 57 int res = 0; 58 int print_dtrwait = 1, print_drainwait = 1; 59 int dtrwait = -1, drainwait = -1; 60 61 if (argc < 2) 62 usage(); 63 64 if (strcmp(argv[1], "-") == 0) 65 fd = STDIN_FILENO; 66 else { 67 fd = open(argv[1], O_RDONLY|O_NONBLOCK, 0); 68 if (fd < 0) { 69 warn("couldn't open file %s", argv[1]); 70 return 1; 71 } 72 } 73 if (argc == 2) { 74 if (ioctl(fd, TIOCMGDTRWAIT, &dtrwait) < 0) { 75 print_dtrwait = 0; 76 if (errno != ENOTTY) { 77 res = 1; 78 warn("TIOCMGDTRWAIT"); 79 } 80 } 81 if (ioctl(fd, TIOCGDRAINWAIT, &drainwait) < 0) { 82 print_drainwait = 0; 83 if (errno != ENOTTY) { 84 res = 1; 85 warn("TIOCGDRAINWAIT"); 86 } 87 } 88 if (print_dtrwait) 89 printf("dtrwait %d ", dtrwait); 90 if (print_drainwait) 91 printf("drainwait %d ", drainwait); 92 printf("\n"); 93 } else { 94 while (argv[2] != NULL) { 95 if (!strcmp(argv[2],"dtrwait")) { 96 if (dtrwait >= 0) 97 usage(); 98 if (argv[3] == NULL || !isdigit(argv[3][0])) 99 usage(); 100 dtrwait = atoi(argv[3]); 101 argv += 2; 102 } else if (!strcmp(argv[2],"drainwait")) { 103 if (drainwait >= 0) 104 usage(); 105 if (argv[3] == NULL || !isdigit(argv[3][0])) 106 usage(); 107 drainwait = atoi(argv[3]); 108 argv += 2; 109 } else 110 usage(); 111 } 112 if (dtrwait >= 0) { 113 if (ioctl(fd, TIOCMSDTRWAIT, &dtrwait) < 0) { 114 res = 1; 115 warn("TIOCMSDTRWAIT"); 116 } 117 } 118 if (drainwait >= 0) { 119 if (ioctl(fd, TIOCSDRAINWAIT, &drainwait) < 0) { 120 res = 1; 121 warn("TIOCSDRAINWAIT"); 122 } 123 } 124 } 125 126 close(fd); 127 return res; 128 } 129